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The far wake behind cylinders at hypersonic speeds. Part I: Flowfield

Behrens, W. (1967) The far wake behind cylinders at hypersonic speeds. Part I: Flowfield. AIAA Journal, 5 (12). pp. 2135-2141. ISSN 0001-1452.

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The flowfield in the wake of circular cylinders was studies experimentally at a Mach number of 6 to a distance of 2400 diam downstream. In the Reynolds number range considered (Re_d ≈ 300-4000), the inner wake stemming from the cylinder boundary layer is laminar and loses its identity within 60 diam, so that only the outer wake caused by the bow shock is of importance. The flowfield was defined experimentally by Pitot pressure, static pressure, and mean-flow hot-wire measurements. Experiments show that the outer wake can be considered inviscid in the first 100 diam but viscosity is essential thereafter. Within a certain region the experimental results compare well with laminar linear theory but the wake profiles do not become similar within 2400 diam. In one case (Re_d ≈ 960), rapid deviations from steady laminar behavior were observed beyond x/d = 1600, indicating breakdown of this flow because of strong nonlinear instabilities that increase “the effective diffusivity.” The stability problem of these wakes is considered in Pt. II of this study (to be published in AIAA Journal).

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Additional Information:© 1967 AIAA. Presented as Part I of Paper 67-32 at the AIAA Fifth Aerospace Sciences Meeting, New York, January 23-26, 1967. Submitted March 23, 1967, revision received June 12, 1967. This work was carried out under the sponsorship and with the financial support of the U.S. Army Research Office and the Advanced Research Projects Agency, Contract DA-31-124-ARO(D)-33. This research is part of Project Defender sponsored by the Advanced Projects Agency. The author wishes to express his sincere thanks and deep appreciation to L. Lees for his guidance and support throughout this research and to T. Kubota, who was always available to give invaluable advice.
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Army Research Office (ARO)UNSPECIFIED
Advanced Research Projects Agency (ARPA)DA-31-124-ARO(D)-33
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AIAA Paper67-32
Issue or Number:12
Record Number:CaltechAUTHORS:20170731-152129563
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Official Citation:The far wake behind cylinders at hypersonic speeds. I. W. BEHRENS AIAA Journal 1967 5:12, 2135-2141
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79627
Deposited By: Tony Diaz
Deposited On:01 Aug 2017 19:20
Last Modified:03 Oct 2019 18:22

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